Content-Type是HTTP協議header中一個重要的參數，它用於標識發送或接收到的數據的類型，瀏覽器根據該參數來決定數據的打開方式。在最早的HTTP協議中，並沒有附加的數據類型信息，所有傳送的數據都被客戶程序解釋爲超文本標記語言HTML 文檔，而爲了支持多媒體數據類型，HTTP協議中就使用了附加在文檔之前的MIME數據類型信息來標識數據類型，它使得HTTP傳輸的不再是普通的文本，讓網頁內容變得豐富多彩。
本文地址：http://blog.csdn.net/chen_zw/article/details/18792923
Content-Type使用的是“主類型/子類型; 額外參數” ( [type]/[subtype]; parameter)的數值格式。
“主類型”（type）主要有以下幾種：
1. text：用於標準化地表示的文本信息，文本消息可以是多種字符集和或者多種格式的；默認是text/plain；
2. multipart：用於連接消息體的多個部分構成一個消息，這些部分可以是不同類型的數據；默認是multipart/mixed；
3. application：用於傳輸應用程序數據或者二進制數據；默認是application/octet-stream；
4. message：用於包裝一個E-mail消息；
5. image：用於傳輸靜態圖片數據；
6. audio：用於傳輸音頻或者音聲數據；
7. video：用於傳輸動態影像數據，可以是與音頻編輯在一起的視頻數據格式。
8. drawing：--未整理
9. java：--未整理
10 Model：--未整理
“子類型” （subtype）用於指定"主類型"的詳細形式。其中以x-開頭表示該類別尚未標準化。當客戶端不能確定“子類型”時，會根據“主類型”來獲取默認的子類型。
"額外參數"（parameter）用於指定請求/響應內容的字符編碼格式。例如text/html;charset=utf-8；
MIME類型標準是通過Internet的IANA組織來制定的，但由於Internet發展的太快，很多應用程序等不及IANA來確認他們使用的MIME類型爲標準類型，因此他們使用在類別中以x-開頭的方法標識這個類別還沒有成爲標準，例如：x-gzip，x-tar等。事實上這些類型運用的很廣泛，已經成爲了事實標準。只要客戶機和服務器共同承認這個MIME類型，即使它是不標準的類型也沒有關係，客戶程序就能根據MIME類型，採用具體的處理手段來處理數據。而Web服務器和瀏覽器（包括操作系統）中，缺省都設置了標準的和常見的MIME類型，只有對於不常見的 MIME類型，才需要同時設置服務器和客戶瀏覽器，以進行識別。
以下整理了最新的MIME類型，保存成properties資源文件：
.*=application/octet-stream
.tif=application/x-tif
.001=application/x-001
.301=application/x-301
.323=text/h323
.906=application/x-906
.907=drawing/907
.a11=application/x-a11
.acp=audio/x-mei-aac
.ai=application/postscript
.aif=audio/aiff
.aifc=audio/aiff
.aiff=audio/aiff
.anv=application/x-anv
.asa=text/asa
.asf=video/x-ms-asf
.asp=text/asp
.asx=video/x-ms-asf
.au=audio/basic
.avi=video/avi
.awf=application/vnd.adobe.workflow
.biz=text/xml
.bmp=application/x-bmp
.bot=application/x-bot
.c4t=application/x-c4t
.c90=application/x-c90
.cal=application/x-cals
.cat=application/vnd.ms-pki.seccat
.cdf=application/x-netcdf
.cdr=application/x-cdr
.cel=application/x-cel
.cer=application/x-x509-ca-cert
.cg4=application/x-g4
.cgm=application/x-cgm
.cit=application/x-cit
.class=java/*
.cml=text/xml
.cmp=application/x-cmp
.cmx=application/x-cmx
.cot=application/x-cot
.crl=application/pkix-crl
.crt=application/x-x509-ca-cert
.csi=application/x-csi
.css=text/css
.cut=application/x-cut
.dbf=application/x-dbf
.dbm=application/x-dbm
.dbx=application/x-dbx
.dcd=text/xml
.dcx=application/x-dcx
.der=application/x-x509-ca-cert
.dgn=application/x-dgn
.dib=application/x-dib
.dll=application/x-msdownload
.doc=application/msword
.dot=application/msword
.drw=application/x-drw
.dtd=text/xml
.dwf=application/x-dwf
.dwg=application/x-dwg
.dxb=application/x-dxb
.dxf=application/x-dxf
.edn=application/vnd.adobe.edn
.emf=application/x-emf
.eml=message/rfc822
.ent=text/xml
.epi=application/x-epi
.eps=application/postscript
.etd=application/x-ebx
.exe=application/x-msdownload
.fax=image/fax
.fdf=application/vnd.fdf
.fif=application/fractals
.fo=text/xml
.frm=application/x-frm
.g4=application/x-g4
.gbr=application/x-gbr
.gif=image/gif
.gl2=application/x-gl2
.gp4=application/x-gp4
.hgl=application/x-hgl
.hmr=application/x-hmr
.hpg=application/x-hpgl
.hpl=application/x-hpl
.hqx=application/mac-binhex40
.hrf=application/x-hrf
.hta=application/hta
.htc=text/x-component
.htm=text/html
.html=text/html
.htt=text/webviewhtml
.htx=text/html
.icb=application/x-icb
.ico=application/x-ico
.iff=application/x-iff
.ig4=application/x-g4
.igs=application/x-igs
.iii=application/x-iphone
.img=application/x-img
.ins=application/x-internet-signup
.isp=application/x-internet-signup
.IVF=video/x-ivf
.java java/*
.jfif=image/jpeg
.jpe=application/x-jpe
.jpeg=image/jpeg
.jpg=application/x-jpg
.js=application/x-javascript
.jsp=text/html
.la1=audio/x-liquid-file
.lar=application/x-laplayer-reg
.latex=application/x-latex
.lavs=audio/x-liquid-secure
.lbm=application/x-lbm
.lmsff=audio/x-la-lms
.ls=application/x-javascript
.ltr=application/x-ltr
.m1v=video/x-mpeg
.m2v=video/x-mpeg
.m3u=audio/mpegurl
.m4e=video/mpeg4
.mac=application/x-mac
.man=application/x-troff-man
.math=text/xml
.mdb=application/x-mdb
.mfp=application/x-shockwave-flash
.mht=message/rfc822
.mhtml=message/rfc822
.mi=application/x-mi
.mid=audio/mid
.midi=audio/mid
.mil=application/x-mil
.mml=text/xml
.mnd=audio/x-musicnet-download
.mns=audio/x-musicnet-stream
.mocha=application/x-javascript
.movie=video/x-sgi-movie
.mp1=audio/mp1
.mp2=audio/mp2
.mp2v=video/mpeg
.mp3=audio/mp3
.mp4=video/mpeg4
.mpa=video/x-mpg
.mpd=application/vnd.ms-project
.mpe=video/x-mpeg
.mpeg=video/mpg
.mpg=video/mpg
.mpga=audio/rn-mpeg
.mpp=application/vnd.ms-project
.mps=video/x-mpeg
.mpt=application/vnd.ms-project
.mpv=video/mpg
.mpv2=video/mpeg
.mpw=application/vnd.ms-project
.mpx=application/vnd.ms-project
.mtx=text/xml
.mxp=application/x-mmxp
.net=image/pnetvue
.nrf=application/x-nrf
.nws=message/rfc822
.odc=text/x-ms-odc
.out=application/x-out
.p10=application/pkcs10
.p12=application/x-pkcs12
.p7b=application/x-pkcs7-certificates
.p7c=application/pkcs7-mime
.p7m=application/pkcs7-mime
.p7r=application/x-pkcs7-certreqresp
.p7s=application/pkcs7-signature
.pc5=application/x-pc5
.pci=application/x-pci
.pcl=application/x-pcl
.pcx=application/x-pcx
.pdf=application/pdf
.pdx=application/vnd.adobe.pdx
.pfx=application/x-pkcs12
.pgl=application/x-pgl
.pic=application/x-pic
.pko=application/vnd.ms-pki.pko
.pl=application/x-perl
.plg=text/html
.pls=audio/scpls
.plt=application/x-plt
.png=application/x-png
.pot=application/vnd.ms-powerpoint
.ppa=application/vnd.ms-powerpoint
.ppm=application/x-ppm
.pps=application/vnd.ms-powerpoint
.ppt=application/x-ppt
.pr=application/x-pr
.prf=application/pics-rules
.prn=application/x-prn
.prt=application/x-prt
.ps=application/postscript
.ptn=application/x-ptn
.pwz=application/vnd.ms-powerpoint
.r3t=text/vnd.rn-realtext3d
.ra=audio/vnd.rn-realaudio
.ram=audio/x-pn-realaudio
.ras=application/x-ras
.rat=application/rat-file
.rdf=text/xml
.rec=application/vnd.rn-recording
.red=application/x-red
.rgb=application/x-rgb
.rjs=application/vnd.rn-realsystem-rjs
.rjt=application/vnd.rn-realsystem-rjt
.rlc=application/x-rlc
.rle=application/x-rle
.rm=application/vnd.rn-realmedia
.rmf=application/vnd.adobe.rmf
.rmi=audio/mid
.rmj=application/vnd.rn-realsystem-rmj
.rmm=audio/x-pn-realaudio
.rmp=application/vnd.rn-rn_music_package
.rms=application/vnd.rn-realmedia-secure
.rmvb=application/vnd.rn-realmedia-vbr
.rmx=application/vnd.rn-realsystem-rmx
.rnx=application/vnd.rn-realplayer
.rp=image/vnd.rn-realpix
.rpm=audio/x-pn-realaudio-plugin
.rsml=application/vnd.rn-rsml
.rt=text/vnd.rn-realtext
.rtf=application/x-rtf
.rv=video/vnd.rn-realvideo
.sam=application/x-sam
.sat=application/x-sat
.sdp=application/sdp
.sdw=application/x-sdw
.sit=application/x-stuffit
.slb=application/x-slb
.sld=application/x-sld
.slk=drawing/x-slk
.smi=application/smil
.smil=application/smil
.smk=application/x-smk
.snd=audio/basic
.sol=text/plain
.sor=text/plain
.spc=application/x-pkcs7-certificates
.spl=application/futuresplash
.spp=text/xml
.ssm=application/streamingmedia
.sst=application/vnd.ms-pki.certstore
.stl=application/vnd.ms-pki.stl
.stm=text/html
.sty=application/x-sty
.svg=text/xml
.swf=application/x-shockwave-flash
.tdf=application/x-tdf
.tg4=application/x-tg4
.tga=application/x-tga
.tiff=image/tiff
.tld=text/xml
.top=drawing/x-top
.torrent=application/x-bittorrent
.tsd=text/xml
.txt=text/plain
.uin=application/x-icq
.uls=text/iuls
.vcf=text/x-vcard
.vda=application/x-vda
.vdx=application/vnd.visio
.vml=text/xml
.vpg=application/x-vpeg005
.vsd=application/x-vsd
.vss=application/vnd.visio
.vst=application/x-vst
.vsw=application/vnd.visio
.vsx=application/vnd.visio
.vtx=application/vnd.visio
.vxml=text/xml
.wav=audio/wav
.wax=audio/x-ms-wax
.wb1=application/x-wb1
.wb2=application/x-wb2
.wb3=application/x-wb3
.wbmp=image/vnd.wap.wbmp
.wiz=application/msword
.wk3=application/x-wk3
.wk4=application/x-wk4
.wkq=application/x-wkq
.wks=application/x-wks
.wm=video/x-ms-wm
.wma=audio/x-ms-wma
.wmd=application/x-ms-wmd
.wmf=application/x-wmf
.wml=text/vnd.wap.wml
.wmv=video/x-ms-wmv
.wmx=video/x-ms-wmx
.wmz=application/x-ms-wmz
.wp6=application/x-wp6
.wpd=application/x-wpd
.wpg=application/x-wpg
.wpl=application/vnd.ms-wpl
.wq1=application/x-wq1
.wr1=application/x-wr1
.wri=application/x-wri
.wrk=application/x-wrk
.ws=application/x-ws
.ws2=application/x-ws
.wsc=text/scriptlet
.wsdl=text/xml
.wvx=video/x-ms-wvx
.xdp=application/vnd.adobe.xdp
.xdr=text/xml
.xfd=application/vnd.adobe.xfd
.xfdf=application/vnd.adobe.xfdf
.xhtml=text/html
.xls=application/x-xls
.xlw=application/x-xlw
.xml=text/xml
.xpl=audio/scpls
.xq=text/xml
.xql=text/xml
.xquery=text/xml
.xsd=text/xml
.xsl=text/xml
.xslt=text/xml
.xwd=application/x-xwd
.x_b=application/x-x_b
.sis=application/vnd.symbian.install
.sisx=application/vnd.symbian.install
.x_t=application/x-x_t
.ipa=application/vnd.iphone
.apk=application/vnd.android.package-archive
.xap=application/x-silverlight-app properties資源文件下載地址：http://download.csdn.net/detail/czw2010/6888263